Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21352#discussion_r188940909
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -870,6 +870,7 @@ case class ArrayMin(child: Expression) extends
UnaryExpression with ImplicitCast
override protected def nullSafeEval(input: Any): Any = {
var min: Any = null
+ val ordering = TypeUtils.getInterpretedOrdering(dataType)
--- End diff --
We can't do this, `nullSafeEval` is called for every input record
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